the navy, the department of veteran affairs and two defense contractors are named as defendants. all are accused of negligence. knight's sister says the system is flawed and needs to be fixed. with we are all just torn apart and we want to get through this and make a change and make a difference so her life wasn't in vain. >> the lawsuit alleges federal agencies and contractors did not act on rd flags about the mental health of navy yard gunman. and also says navy yard security was lax alexis killed 12 people before he died in a shootout with police in september. >>> dick cheney is commenting on camera about a family feud between the two daughters. the siblings spat began when liz cheney reiterated her support for traditional marriage. she's locked in a tight republican primary battle. her sister, mary cheney, on the right there, is married to her partner, heather. the couple took to facebook to criticize liz cheney's stand against same-sex marriage. he was asked about the controversy last night. >> we were surprised when there was an attack launched on facebook. and wish it hadn